Source Code : Make Unique Column in Database Table

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Make Unique Column in Database Table

  

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class Main {
  public static void main(String[] argv) throws Exception {

    Class.forName("com.mysql.jdbc.Driver");
    Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/jdbctutorial",
        "root", "root");

    Statement st = con.createStatement();
    int n = st.executeUpdate("ALTER TABLE mytable ADD UNIQUE( colName)");
    System.out.println("Query OK, " + n + " rows affected.");
  }
}

   
    
  

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